There are 79 car parts that start with the letter O. From Oil Baffle to Oxygen Sensor Wiring Harness. Car parts refer to the various components that make up a vehicle, each playing a crucial role in its overall operation and performance. These parts can range from essential functional components like engines and transmissions, to auxiliary parts such as belts and hoses. The proper maintenance and timely replacement of car parts are vital for ensuring vehicle safety, efficiency, and longevity. With advancements in technology, many car parts now include electronic components, enhancing their functionality and enabling features such as automated driving systems and improved infotainment options.

An interesting fact about car parts is that many vehicles contain around 30,000 different parts, and the automotive industry is continuously evolving with new materials and technologies. For instance, lightweight composites are increasingly being used to improve fuel efficiency, while high-strength steel remains a staple for structural components due to its durability.

Here’s what each of the columns in the table means:

Function: A brief description of what the car part does within the vehicle system.

Maintenance Interval (months): The recommended time period after which the part should be inspected or replaced, measured in months.

Replacement Cost (USD): An estimate of the average monetary cost incurred when replacing the part, expressed in U.S. dollars.

Description: A detailed explanation of the car part, including its significance, materials, and placement in the car’s architecture.

Car parts That Start With O

Car parts function maintenance interval (months) replacement cost (USD)
Oil Baffle A plate or wall inside the oil pan that helps to control the flow and movement of the engine oil 36-60 $20-$80
Oil Breather Cap Allows excess pressure and vapors to escape the engine’s crankcase, preventing oil leaks 12-24 $5-$20
Oil Catch Can A reservoir that collects oil vapor and condensation from the crankcase ventilation system, preventing it from entering the intake 24-36 $20-$100
Oil Change Reminder Light An indicator on the dashboard that alerts the driver when it’s time to change the engine oil 12-24 $10-$50
Oil Charge Pipe Transfers oil from the oil pump to the engine components 12 50
Oil Control Valve Regulates the flow of oil to the variable valve timing system, ensuring optimal engine performance 24-36 $50-$150
Oil Cooler Helps to regulate the temperature of the engine oil, preventing it from getting too hot and breaking down 36-60 $100-$300
Oil Cooler Bypass Valve Regulates oil flow through the oil cooler 24 30
Oil Cooler Hose Transports the engine oil to and from the oil cooler, allowing it to be effectively cooled 24-36 $20-$50
Oil Dilution Sensor Monitors the level of fuel dilution in the engine oil, alerting the driver or engine control unit to potential issues 24-36 $50-$150
Oil Dipstick Allows the driver to check the level and condition of the engine oil 6-12 $5-$20
Oil Dipstick Tube Houses the oil dipstick 36 15
Oil Drain Gasket Seals the oil drain plug 12 5
Oil Drain Hose Carries the used engine oil from the oil pan to the external drain location during oil changes 12-24 $10-$30
Oil Drain Plug Allows the engine oil to be drained from the oil pan during service or oil changes 12-24 $5-$20
Oil Drain Tube Facilitates the removal of used engine oil from the oil pan during an oil change. N/A $10 – $30
Oil Extraction Pump Used to remove old oil from the engine during an oil change service. N/A $50 – $100
Oil Extraction Tool Assists in the removal of the oil filter during an oil change. N/A $10 – $25
Oil Feed Line Delivers fresh engine oil from the oil pump to the various components that require lubrication. 24 $20 – $75
Oil Filler Cap Provides access to the engine’s oil fill point, allowing the driver to add oil as needed 12-24 $5-$20
Oil Filter Removes impurities from engine oil, ensuring smooth operation and extended engine life 3-6 $5-$20
Oil Filter Adapter Connects the oil filter to the engine block 48 40
Oil Filter Housing Holds the oil filter in place 48 60
Oil Filter Mounting Bracket Supports the oil filter housing 60 20
Oil Filtration System The complete set of components, including the oil filter, that remove contaminants from the engine oil 12-24 $50-$200
Oil Flow Control Valve Regulates the oil flow to the turbocharger bearings, ensuring proper lubrication and preventing damage 24-36 $50-$150
Oil Foaming Inhibitor An additive that helps prevent the engine oil from becoming aerated and foamy, maintaining its lubricating properties 12-24 $5-$20
Oil Galleries The internal passages within the engine block that allow oil to be distributed to the various moving parts 36-60 $100-$500
Oil Galley Plug Blocks off unused oil passages in the engine block, directing oil flow to the appropriate components. N/A $5 – $15
Oil Jet Directs a targeted stream of oil onto specific engine components, such as the connecting rod bearings, to improve lubrication 24-36 $10-$30
Oil Leak Detector Dye A fluorescent additive that is mixed with the engine oil to help identify the source of oil leaks 12-24 $5-$20
Oil Level Dipstick Allows the driver or mechanic to check the oil level in the engine. 12 $5 – $20
Oil Level Indicator Provides a visual or electronic indication of the engine’s oil level, allowing the driver to check it easily 12-24 $10-$50
Oil Level Sensor Monitors the engine oil level and sends a signal to the driver or engine control unit when the level is low 24-36 $20-$80
Oil Level Sensor Connector Electrical interface for the oil level sensor 24 15
Oil Level Warning Light A dashboard indicator that alerts the driver when the engine oil level is dangerously low 12-24 $10-$50
Oil Metering Pump Precisely controls the flow of oil to the turbocharger bearings in turbocharged engines 24-36 $100-$300
Oil Mist Separator Removes oil droplets and vapors from the crankcase ventilation system, reducing oil consumption and emissions 36-60 $50-$150
Oil Pan Holds the engine’s oil supply and allows the oil pump to draw oil from the bottom of the pan 60-120 $50-$200
Oil Pan Baffle Redirects oil flow in the oil pan 48 25
Oil Pan Gasket Forms a seal between the oil pan and the engine block, preventing oil leaks 24-36 $10-$50
Oil Pan Skid Plate Protects the oil pan from road debris 60 40
Oil Passage Plug Seals unused oil passages 60 10
Oil Pickup Screen Filters oil before entering the pump 48 15
Oil Pressure Gauge Displays the current oil pressure within the engine’s lubrication system 36-60 $20-$100
Oil Pressure Hose Transports oil pressure to the gauge 48 20
Oil Pressure Regulator Maintains the proper oil pressure within the engine’s lubrication system 36-60 $50-$150
Oil Pressure Relief Solenoid Regulates oil pressure 36 50
Oil Pressure Relief Valve Opens to bypass excess oil pressure and maintain the optimal pressure within the lubrication system 36-60 $20-$80
Oil Pressure Sensor Provides the engine control unit with information about the oil pressure, enabling the detection of low pressure 24-36 $20-$80
Oil Pressure Switch Monitors the oil pressure in the engine and triggers a warning light if the pressure drops below a safe level 12-24 $20-$50
Oil Pressure Switch Connector Provides the electrical connection between the oil pressure switch and the engine control unit or warning light 12-24 $5-$20
Oil Pump Circulates engine oil throughout the engine, providing lubrication to critical components 24-36 $50-$150
Oil Pump Chain Drives the oil pump 60 35
Oil Pump Drive Transfers rotational power from the engine to the oil pump, ensuring the oil is circulated throughout the system 36-60 $50-$150
Oil Pump Drive Gear Transmits power to the oil pump 60 25
Oil Pump Gear The driving gear that transfers rotational power from the engine to the oil pump, ensuring the oil is circulated 36-60 $20-$80
Oil Pump Pickup Tube Draws oil from the sump 48 20
Oil Pump Relief Valve Opens to bypass excess oil pressure and maintain the optimal pressure within the lubrication system 36-60 $20-$80
Oil Pump Screen Filters out large contaminants before the oil enters the oil pump, protecting it from damage 12-24 $10-$30
Oil Return Line Transports the excess or used oil from the turbocharger bearings back to the engine’s oil sump 24-36 $20-$50
Oil Seal Prevents leaks by creating a tight barrier between two moving parts, such as a shaft and a housing 36-60 $5-$50
Oil Separator Removes oil mist and vapors from the crankcase ventilation system, reducing oil consumption and emissions 36-60 $50-$150
Oil Sludge Remover A chemical additive that helps dissolve and flush out built-up sludge deposits in the engine oil system 12-24 $10-$30
Oil Spray Nozzle Directs a fine mist of oil onto the underside of the piston, providing additional cooling and lubrication 24-36 $10-$30
Oil Squirter Sprays oil directly onto the underside of the piston to help cool and lubricate the cylinder walls 24-36 $20-$80
Oil Strainer Filters out larger contaminants from the engine oil before it enters the oil pump 24-36 $10-$30
Oil Sump The oil pan, which holds the engine’s oil supply and allows the oil pump to draw oil from the bottom of the pan 60-120 $50-$200
Oil Temperature Sensor Monitors the temperature of the engine oil, providing data to the engine control unit for optimal performance 24-36 $20-$80
Oil Throttle Valve Controls the flow of oil to the variable valve timing system, optimizing engine performance 24-36 $50-$150
Oil Transfer Pipe Transports oil from the oil pump to the oil filter and other components in the lubrication system 36-60 $20-$100
Oil Transfer Pump Moves oil from the oil pan to the engine components that require lubrication. 12 75-150
Oil Vapor Separator Removes oil droplets from the crankcase ventilation system, reducing oil consumption and emissions. 24 50-100
Oil Volume Control Solenoid Electronically regulates the flow of engine oil to optimize lubrication and reduce wear. 24 75-150
Oil Withdrawal Valve Allows the controlled release of excess engine oil during operation. 18 25-50
Overflow Hose Provides a safe path for excess coolant to escape the cooling system during expansion. 24 10-25
Oxygen Sensor Monitors the air-fuel ratio in the engine exhaust and provides feedback to the engine control module. 36 75-150
Oxygen Sensor Heater Warms the oxygen sensor to its operating temperature, ensuring accurate readings. 36 25-50
Oxygen Sensor Wiring Harness Provides the electrical connection between the oxygen sensor and the engine control module. 36 25-50

Descriptions

Oil Baffle
The oil baffle is a structural component within the oil pan that is designed to redirect and stabilize the flow of engine oil, preventing it from sloshing around excessively and ensuring a consistent supply of oil to the oil pump inlet.
Oil Breather Cap
The oil breather cap is a ventilation device that releases pressure buildup and oil vapors from the engine’s crankcase, helping to maintain a proper oil level and prevent oil leaks.
Oil Catch Can
The oil catch can is an accessory component that is installed in the crankcase ventilation system to trap and collect any oil mist, vapor, or condensation that would otherwise be drawn back into the engine’s intake, helping to reduce oil consumption and prevent intake system buildup.
Oil Change Reminder Light
The oil change reminder light is a warning system that monitors the engine’s oil life and illuminates a dashboard light when it’s time to perform an oil change, helping to ensure the engine receives regular maintenance and preventing damage from neglected oil changes.
Oil Charge Pipe
A metal or rubber pipe that carries pressurized oil from the oil pump to the engine’s moving parts, ensuring adequate lubrication.
Oil Control Valve
The oil control valve is a specialized component that manages the flow of engine oil to the variable valve timing system, allowing the engine to adjust its valve timing for improved efficiency and power output.
Oil Cooler
The oil cooler is a heat exchanger that uses coolant or air to lower the temperature of the engine oil, improving its lubricating properties and extending the life of the oil and engine components.
Oil Cooler Bypass Valve
A valve that diverts oil around the oil cooler when the engine is cold, allowing the oil to reach optimal operating temperature more quickly.
Oil Cooler Hose
The oil cooler hose is a reinforced rubber or metal-braided line that carries the hot engine oil from the engine to the oil cooler and back, facilitating the cooling of the oil to maintain optimal viscosity and lubrication properties.
Oil Dilution Sensor
The oil dilution sensor is an electronic component that measures the amount of unburnt fuel that has mixed with the engine oil, indicating problems such as worn piston rings or fuel injector issues. This data allows the engine control unit to make adjustments or alert the driver to the need for maintenance.
Oil Dipstick
The oil dipstick is a simple but essential component that enables the driver to easily check the oil level and, in some cases, the oil condition, to ensure the engine is properly lubricated.
Oil Dipstick Tube
A metal or plastic tube that guides the oil dipstick into the oil sump, allowing easy access for checking the oil level.
Oil Drain Gasket
A small washer or gasket that creates a tight seal around the oil drain plug to prevent leaks.
Oil Drain Hose
The oil drain hose is a flexible tube or pipe that is connected to the oil drain plug, allowing the engine oil to be easily and cleanly drained from the oil pan during routine maintenance or oil changes.
Oil Drain Plug
The oil drain plug is a threaded bolt or cap located at the bottom of the oil pan that can be removed to fully drain the engine’s oil supply, making it easier to perform routine oil changes and maintenance.
Oil Drain Tube
The oil drain tube is a simple but essential component, allowing mechanics to efficiently drain the oil from the engine without spills or leaks.
Oil Extraction Pump
This specialized pump is designed to quickly and completely extract used engine oil from the oil pan, ensuring a thorough oil change and preventing any residual oil from remaining in the system.
Oil Extraction Tool
The oil extraction tool is a handheld device that helps mechanics grip and loosen the oil filter, making the oil change process easier and more efficient.
Oil Feed Line
The oil feed line is a vital part of the engine’s lubrication system, ensuring that critical components like the crankshaft, camshaft, and valvetrain receive a constant supply of oil to reduce friction and wear.
Oil Filler Cap
The oil filler cap is the removable cover that gives access to the engine’s oil fill point, enabling the driver to easily check the oil level and add more oil when necessary.
Oil Filter
The oil filter is a crucial component in a car’s lubrication system, capturing dirt, metal shavings, and other contaminants before they can circulate through the engine and cause damage.
Oil Filter Adapter
A housing that allows the oil filter to be easily installed and removed, often incorporating an oil pressure sensor or bypass valve.
Oil Filter Housing
The main component that secures the oil filter to the engine, ensuring a proper seal and oil flow.
Oil Filter Mounting Bracket
A metal bracket that holds the oil filter housing in the correct position, preventing vibration and misalignment.
Oil Filtration System
The oil filtration system is the comprehensive network of parts, centered around the oil filter, that work together to clean the engine oil, removing debris, metal shavings, and other impurities that could otherwise circulate through the engine and cause wear or damage.
Oil Flow Control Valve
The oil flow control valve is a specialized component found in turbocharged engines that precisely controls the amount of oil delivered to the turbocharger bearings, ensuring they receive the optimal lubrication for their operating conditions.
Oil Foaming Inhibitor
The oil foaming inhibitor is a chemical additive that is blended into the engine oil to reduce the formation of air bubbles or foam, which can otherwise impair the oil’s ability to effectively lubricate the engine’s moving parts and lead to increased wear and reduced efficiency.
Oil Galleries
The oil galleries are the network of passages and channels within the engine block that carry the pressurized oil from the oil pump to the bearings, cylinders, and other components that require lubrication.
Oil Galley Plug
Oil galley plugs are used to seal off unused oil galleries in the engine, ensuring that the oil is directed to the components that require lubrication and preventing leaks or oil starvation.
Oil Jet
The oil jet is a small nozzle or orifice that sprays a precise amount of engine oil onto critical engine components, like the connecting rod bearings, to ensure they receive adequate lubrication and cooling, reducing wear and improving engine efficiency.
Oil Leak Detector Dye
Oil leak detector dye is a specialized chemical that is added to the engine oil, allowing technicians to use a UV light to easily identify the location of any oil leaks in the engine or lubrication system, making it easier to diagnose and repair the problem.
Oil Level Dipstick
The oil level dipstick is a simple but essential component, enabling regular monitoring of the engine’s oil quantity to ensure proper lubrication and prevent potential damage.
Oil Level Indicator
The oil level indicator is a device, such as a dipstick or an electronic sensor, that displays the current engine oil level, enabling the driver to quickly and easily check the oil and add more if necessary to maintain proper lubrication.
Oil Level Sensor
The oil level sensor is an electronic component that continuously checks the engine’s oil level and provides a warning if the oil needs to be topped up, helping to prevent engine damage due to insufficient lubrication.
Oil Level Sensor Connector
A wiring harness that connects the oil level sensor to the vehicle’s electrical system, transmitting oil level data to the ECU.
Oil Level Warning Light
The oil level warning light is a safety feature that monitors the engine’s oil level and turns on a dashboard warning light when the oil is at a critically low level, allowing the driver to safely stop the vehicle and ad
Oil Metering Pump
The oil metering pump is a specialized component found in turbocharged engines that accurately delivers the correct amount of oil to the turbocharger bearings, ensuring proper lubrication and preventing premature wear.
Oil Mist Separator
The oil mist separator is a device that extracts oil mist and vapors from the crankcase ventilation system, returning the oil to the engine’s lubrication system and reducing both oil consumption and the release of hydrocarbons into the atmosphere.
Oil Pan
The oil pan is the bottom-most part of the engine’s lubrication system, acting as a reservoir for the engine oil and allowing the oil pump to draw in the oil and circulate it through the engine.
Oil Pan Baffle
A plate or divider installed inside the oil pan that helps to control the movement of oil, preventing oil starvation during cornering or braking.
Oil Pan Gasket
The oil pan gasket is a crucial sealing component that creates a tight, leak-proof connection between the oil pan and the engine block, ensuring that the engine oil remains contained within the lubrication system and does not leak out.
Oil Pan Skid Plate
A sturdy metal or plastic shield installed underneath the oil pan to safeguard it from damage caused by road hazards.
Oil Passage Plug
A threaded plug that blocks off unused oil galleries or passages in the engine block, preventing oil leaks.
Oil Pickup Screen
A mesh screen installed at the end of the oil pickup tube, trapping large contaminants and preventing them from entering the oil pump.
Oil Pressure Gauge
The oil pressure gauge is an instrument that measures and displays the oil pressure in the engine, allowing the driver to monitor the health of the lubrication system and detect any issues that may arise.
Oil Pressure Hose
A flexible hose that carries the engine’s oil pressure signal from the oil pressure sensor or switch to the oil pressure gauge.
Oil Pressure Regulator
The oil pressure regulator is a valve that controls the oil pressure by allowing excess oil to be bypassed back to the oil pan, ensuring the engine receives the optimal oil pressure for its operating conditions.
Oil Pressure Relief Solenoid
An electronically controlled valve that adjusts the oil pressure based on engine operating conditions, optimizing lubrication and efficiency.
Oil Pressure Relief Valve
The oil pressure relief valve is a safety device that opens when the oil pressure exceeds a predetermined limit, allowing the excess oil to be redirected back to the oil pan and preventing damage to the engine’s components due to excessive pressure.
Oil Pressure Sensor
The oil pressure sensor is an electronic component that monitors the oil pressure in the engine and sends this data to the engine control unit, which can then trigger a warning light or take other actions if the pressure drops to an unsafe level.
Oil Pressure Switch
The oil pressure switch is a safety device that alerts the driver to low oil pressure, which can indicate a problem with the oil pump, oil passages, or other lubrication system components.
Oil Pressure Switch Connector
The oil pressure switch connector is the wiring harness or plug that links the oil pressure switch to the engine’s electrical system, allowing the switch to communicate low oil pressure conditions to the driver or the engine control unit.
Oil Pump
The oil pump is responsible for drawing oil from the oil pan and distributing it under pressure to the engine’s bearings, gears, and other moving parts, helping to reduce friction and wear.
Oil Pump Chain
A metal chain that transfers rotational motion from the engine crankshaft to the oil pump, ensuring a consistent oil supply.
Oil Pump Drive
The oil pump drive is the mechanism, such as a gear or chain, that connects the oil pump to the engine’s crankshaft or timing system, providing the necessary rotational force to drive the oil pump and maintain proper lubrication.
Oil Pump Drive Gear
A gear that meshes with the crankshaft gear to provide the necessary rotational force to drive the oil pump.
Oil Pump Gear
The oil pump gear is the toothed gear that connects the oil pump to the engine’s crankshaft or timing system, providing the necessary rotational force to drive the oil pump and maintain proper lubrication throughout the engine.
Oil Pump Pickup Tube
A metal tube that extends from the oil pump into the oil sump, allowing the pump to draw lubricating oil from the reservoir.
Oil Pump Relief Valve
The oil pump relief valve is a safety device that opens when the oil pressure generated by the oil pump exceeds a predetermined limit, allowing the excess oil to be redirected back to the oil pan and preventing damage to the engine’s components due to excessive pressure.
Oil Pump Screen
The oil pump screen is a mesh filter located at the oil pump inlet that traps larger debris, preventing it from being drawn into the oil pump and potentially causing damage to the engine’s internal components.
Oil Return Line
The oil return line is a hose or pipe that carries the oil that has lubricated the turbocharger bearings back to the engine’s oil pan, ensuring the oil is recirculated and not lost from the lubrication system.
Oil Seal
Oil seals are critical components that help retain and contain the engine oil within the engine, preventing costly leaks and ensuring the proper lubrication of moving parts.
Oil Separator
The oil separator is a device that extracts oil droplets and vapors from the crankcase ventilation system, returning the oil to the engine’s lubrication system and reducing oil consumption and the release of hydrocarbons into the atmosphere.
Oil Sludge Remover
Oil sludge remover is a specialized product that is added to the engine oil, where it helps to break down and liquefy any thick, sticky sludge deposits that have accumulated in the oil passages, oil pump, or other lubrication system components, allowing the sludge to be flushed out during an oil change.
Oil Spray Nozzle
The oil spray nozzle is a specialized component that atomizes and sprays engine oil onto the underside of the pistons, helping to reduce friction and heat buildup within the cylinders, improving overall engine performance and efficiency.
Oil Squirter
The oil squirter is a nozzle or jet located in the engine block that directs a controlled stream of oil onto the underside of the pistons, helping to reduce friction and heat buildup within the cylinders.
Oil Strainer
The oil strainer is a mesh or screen filter placed in the oil pick-up tube, trapping larger debris and particles before the oil reaches the oil pump, helping to protect the pump and other lubrication system components from damage.
Oil Sump
The oil sump is the bottommost part of the engine’s lubrication system, serving as a reservoir for the engine oil and allowing the oil pump to draw in the oil and circulate it through the engine.
Oil Temperature Sensor
The oil temperature sensor is an electronic component that measures the temperature of the engine oil and sends this information to the engine control unit, which can then adjust parameters like ignition timing, fuel delivery, and oil pressure to maintain optimal operating conditions.
Oil Throttle Valve
The oil throttle valve is a component that regulates the amount of engine oil delivered to the variable valve timing system, allowing the engine to adjust its valve timing for improved efficiency, power, and emissions control.
Oil Transfer Pipe
The oil transfer pipe is a hose or tube that carries the pressurized oil from the oil pump to the oil filter, engine bearings, and other parts of the engine’s lubrication system that require a steady supply of oil.
Oil Transfer Pump
Ensures a steady supply of engine oil to critical areas, preventing wear and damage.
Oil Vapor Separator
Prevents excess oil from entering the intake system, improving engine efficiency and reducing environmental impact.
Oil Volume Control Solenoid
Allows the engine control module to precisely manage oil pressure and flow, improving fuel economy and engine performance.
Oil Withdrawal Valve
Maintains proper oil level in the crankcase, preventing oil leaks and reducing the risk of engine damage.
Overflow Hose
Prevents coolant spillage and potential damage to the engine or surrounding components in the event of a system overpressure.
Oxygen Sensor
Ensures optimal combustion efficiency and emission control, improving performance and reducing environmental impact.
Oxygen Sensor Heater
Enables the oxygen sensor to function correctly, even during cold engine conditions, maintaining proper engine performance and emissions control.
Oxygen Sensor Wiring Harness
Ensures reliable communication and data transfer, allowing the engine control system to adjust the air-fuel ratio effectively.

If you think there is a missing term, let us know using the contact form.